Water separator filter bowl never fills up?
I have a C-15 cat with a H2O/fuel separator filter that never fills the dome to the change filter mark. I can change this filter, fill it back up with #2 ULSD, and drive a complete service mileage interval and the fuel level will never change.
My service intervals are 12,000 miles in which I change all filters, oil, grease, and well a complete bumper to bumper check.
I'm also thinking this may be having a huge impact on my fuel mileage. I have changed stock mufflers to Pittsburgh power mufflers, low rolling resistant tires, K&N air filter, charge air cooler, overhead twice, ecm codes. I know that there is still work to be done, but I have to fix this first.
This has gone on for over a year now, and the level will never rise. Right now it's only purpose I guess is to look good setting there, and waste filters.
Is this a good question?